1998 e320 intermittent no drive/reverse pulled codes

[mespe]

EGS 110 Sporadically Engine speed compar n2 to n3 implausible

EGS 147 Sporadically Gear implausible or Transmission slipping.

My daughter was driving this e320 and it decided it didn't want to go no more.
She shut it off and it drove a little bit more.

Don't think she tried the manual shifting.
Guess I'll be driving it for a while.
If anyone has any suggestions, please pass them this way.

[jay_bob]

It's conductor plate time.

There are speed sensors in the plate that often fail. These sensors check the shaft speed along the gear train in the transmission. When a sensor fails, the computer shuts down the party, because it assumes the transmission is tearing itself apart. If the speeds don't agree through the transmission based on the gear it thinks you are in then it throws the codes.

[MAVA]

When a conductor plate failure occurs. The car goes into limp mode. You only will have 2nd gear and reverse all the time. None of this slipping...or intermittent gear engagement..

Sadly, the 722.6 transmission(which is what you have) does not have pressure ports to monitor pressure as they a way to trouble shoot the older transmissions..., so....because that port is none existent. A few conditions must be met to rule out the problem(s):

A) the fluid must not be no more than a few years old.

B) The fluid level must be measured with a 722.6 testing dipstick

C) the transmission computer must be inspected for transmission fluid contamination.

D) I would drain a quart or so of fluid on a new translucent paint pail from the home center, or better yet, I would drain all the fluid on a new translucent 1 gallon paint pail from the home center.

E) if you removed just the fluid. I would remove the circular connector, and replace it too...

Lastly, you may have had cooler failure and your fluid may be full of water?

Get the dipstick...'


All the best,

Martin

[mespe]

Originally Posted by MAVA

When a conductor plate failure occurs. The car goes into limp mode. You only will have 2nd gear and reverse all the time. None of this slipping...or intermittent gear engagement..

Did not have reverse, or should I say, didn't feel the car going into reverse.
didn't go forward either. shut off, restart, back to normal.

Originally Posted by MAVA

Sadly, the 722.6 transmission(which is what you have) does not have pressure ports to monitor pressure as they a way to trouble shoot the older transmissions..., so....because that port is none existent. A few conditions must be met to rule out the problem(s):

A) the fluid must not be no more than a few years old.

Originally Posted by MAVA

Most of the fluid is newer was replaced when I replaced the circular electrical conenctor seal.

B) The fluid level must be measured with a 722.6 testing dipstick

Measure the fluid with the testing dipstick, was within range.

Originally Posted by MAVA

C) the transmission computer must be inspected for transmission fluid contamination.

Was full of oil when I got the car, prompting the replacement of the electrical seal.

Originally Posted by MAVA

D) I would drain a quart or so of fluid on a new translucent paint pail from the home center, or better yet, I would drain all the fluid on a new translucent 1 gallon paint pail from the home center.

E) if you removed just the fluid. I would remove the circular connector, and replace it too..

already done, when I got the car, the TCM was full of oil. I cleaned it several times. I do have a spare, so I can swap it out should the car misbehave again.

Originally Posted by MAVA

Lastly, you may have had cooler failure and your fluid may be full of water?

Get the dipstick...'


All the best,

Martin

no water (didn't see any on the dipstick.

Car has 227K miles, maybe it is the conductor plate. Is there a test I can do with Xentry?

I erased the codes, cleaned the TCM connector with contact cleaner, I noticed a little bit of residual oil on the pins, and plan on driving the car today.

[mespe]

Took the e320 for a test drive.
started out fine. Got to a stop sign about 3/4 of a mile) . stopped, then no go. after 4-5 restarts trans worked again,
turned around drove half way back (under heavy load, worked fine) , stopped, no go.
Police officer pulls up I explain trans diagnosis,,,
After a few restarts, trans worked. 1/2 way back from the stop
the trans started slippng when under light load.
coasted into the parking lot
restart trans worked
gonna see if codes triggered again, no CEL

[Zulfiqar]

sounds like clogged solenoids or leaking solenoid O rings. (was told by a transmission mechanic who works in chrysler dealership)

btw - its odd that your transmission controller is not shutting down as the transmission very closely reads the in and out speed sensors, it even reads the "shift achieved" timing.

[MAVA]

I have repaired many of these, and the culprits on this is the clutches are so far worn that the clutch pack cannot be pressurized, so the transmission slips..

The speed sensors fail and you get this hard limp mode 2nd and reverse-No slippage

Zulfigar is right, but the one o-ring that cooks hard is the torque converter lock-up solenoid....

If you want to fix this cheap, u need to do some parts swapping and inspection.

I would drain all your fluid on a new clear paint pail from the home center...Inspect that fluid and the pan

I would drop the valve body. Inspect the the solenoid seals.. The hard one will be the torque converter one-You cannot buy these seals by them selves. You need to buy a transmission rebuild seal kit for $90 bucks to get the seals, or new solenoids...Under the two larger solenoids are screen filters, some do not have the filters...I have never seen plugged filters...

Now, a failed speed sensor(s) will look like this-Post35-it will be ruptured..

722.6 Transmission Refresh. DIY and questions.

The intelligent way to test the speed sensors is with a dual trace oscilloscope for the odd pulse.See attachment

Go to the self serve junk yard and get the lockup solenoids, and torque lockup...

Inspect the springs in the valve, but the regulation spring is critical...They break..

Photo DIY- 722.6 Conductor Plate and Regulator Valve Spring R/R - Mercedes-Benz Forum.

Hope it helps,

Martin

[MAVA]

The rest of it...

Ahh valve body diagram

https://s3.amazonaws.com/sonnax-dev/uploads/unit/valve_body_layout/314/VBL-Mercedes-722-6.pdf

This may help too:

Mercedes 722.6 Vacuum Test Guide - Sonnax

Martin

[engatwork]

Subscribing to this post to try to keep up with it.

[mespe]

Wow information overload,,,, wow thanks for all this help. Pulled codes again 97, 110, and 147,,, read those articles and possibly the 110 and 147 point to K12. Test drive in parking lot. I noticed that the trans would take longer and longer to go into gear. Then it wouldn't at all. REstart, and seems the pattern is repeated, fairly consistant. At this time, I'm gonna start swapping parts. Already swapped a TCM, next the relay board in the fuse box. (I have a complete parts car, minus the left front spring,,,

[mespe]

Looks like I'm off to buy a clean pail and drain the trans fluid, to drop the pan and take a look see.

[MAVA]

You are welcome...

Information overload??? That's when you look down at the smartphone or change the channel on the clicker...

This is knowledge!!

[mespe]

here's a youtube video of going between "R" and "D" each time takes a little longer until 100% slippage in R and D and 1,2,3,and 4

e320 transmission slip - YouTube

[MAVA]

Yea,

Saw the video, but the fluid, pan, and conductor plate will say a lot

Martin

[mespe]

So looking like maybe one of the solenoid seals has disintigrated? I don't know